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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9034c9a2014d4fb8ea953dc64ecddd16710956240fa4574be47ca8158d0e35e' 
  AND token = 'MDdZfZajDkN/QV1YuMaPH475CY+lCTGBPT7ev8t+ya8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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