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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6292cd5662178b673afe97cc3ff4b8366d95bdb63adb0e90a3fa4f2b7c2c3a11' 
  AND token = 'brJPl4zMV9sU6/huBi456ACnyIPlMBedZm4rr51gbko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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