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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5f7dffbd0f8289ac6a51375b014211659471782e430d30fa2d532c7e682549' 
  AND token = 'bvrDTCw2WP4puAbz5ot9ScccnKqB9EbiQWMN7YDEEmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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