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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f073d21910f35d3bf3813881b27854bca91ddfe4524ef3bfa0c631a78d16087' 
  AND token = 'T/5M/wYL560JfF7HMZVR/fQ8T1SNmeip60nAMvToGRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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