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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6d8b132bd4efa579e3e1706ee76ebfa5e2fb77eaff67385d8a27c628f356d3' 
  AND token = 'ZtGg3tm6fKZY8Xa8QylY84MuhU4HV09j1hjzOud5E+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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