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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adae1d76fdf452b3005422a0f268bc3756fb826d85f39299a2166c802f509ff9' 
  AND token = 'yAQ5T267I8UNNMGsrcTejA6bLITlpg78Tpr949+nbY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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