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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9fa98c4a82ec682614a5369963388e45441ecb58945d05536d483509bc54d8' 
  AND token = '1qJ08ESXyndQaKTj9lor0QTj3Vx3Sde8JqPeWMjoBWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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