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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32eedb824cd5b61394c9858f10f86ceab5c1454ddfcbc5d73c0b18b7f4a28275' 
  AND token = 'wbJK2cJatT3CvwuyFyz9/5dbxIXln3ws35urXIeem3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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