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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb80db3e82f0223b5df3e260606a8ef167605c3939893c4b9b3c3c8745006b1' 
  AND token = 'TSUiqedJPuTAQaN6FlflPFTYuX/r6hv8NRqc2Uk5GII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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