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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0350f699609340be6fb166f761ddd603fb30f059a280b86116081638ba98d53c' 
  AND token = 'F+6Dz6DukLX7hE2/2kywdFzqnIMtN/I74KYy1NsSCUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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