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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93fd8fce50630f402b9340cb4ef59926f31807c02e425b7920bce97a478b087' 
  AND token = 'y3Qr4O6H2YpCsiQX0+xA2nWU/O/JcAO2n1zx9dZmThc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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