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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d4036c35c0bfbef03e8c568ebf91e89fd162f20b90c5313f3e4ff71b9640d1' 
  AND token = 'IftQdvbEivztOeoGXli7khZNp3nlPxviMJAdqLV2ZQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}