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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f7919c143069ef5d341a4f2cd1c974c68f9b25c194a513301fe3859c87c99f' 
  AND token = 'LdwoloHC04vK+LoZ+2rtFgYPUVcn1GBqi3fD75OOCnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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