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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ad411a0f68759a0bd508a51db5c497cdac7113bec148d0cc88b0ab06ef88d9' 
  AND token = '7NJn+LX8WbXzWmkycbcbyACGgddo5LiSNXSUnS0HPSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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