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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38a9b4f3c44a1ffd5c7b76edcee72e6964e768a5952c73feb0b7d63931df5d1' 
  AND token = 'mmgKEwHxHIEUfWVKabgxeM2oSpUQ4S/22AuxmOl07Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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