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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9c91652ee7f20c0a736a09d02d82f0e8dae68495e24fefa560478479b35825' 
  AND token = '/FMrwSPhA0fr0SQNVYyzcV8qQ3mPEqa79fmFjjF+iiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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