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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12d940a91c7bf135f2013a0115c932f2ed1e9e6beb768b4f6db6f35d129b8a5' 
  AND token = 'ZLAGUHQShl4s6KzqStYOSy85rKM3vFvT5PkysAYAGMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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