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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe51c9610a8835c033582857db14fb4d8c7eeefcb8a73b5241ec97b65621f86c' 
  AND token = 'ht7aLzcYprO3O/8zRNjGWR7JAL/9yULMPP+rH4fgWrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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