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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ba294868c0958d42736db8ff2c381b622a97d8b86055c43a5aec55ce2083b9' 
  AND token = 'xVTV2XmA/+0VU8DPOtfJQvAFd1A4hlbAz0FCH/KTp80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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