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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcf045c256aceb0b1237a793051a264e92fb26a128e65cabfa6edd1a2c874d0' 
  AND token = 'aerU0deqv2pQFayrTTtVRT7bguhM7GGt9/otFN1pNYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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