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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f36c67371e7e5b8f925fb3c02557c2e58eb21a5275088e98da7c07022bf4958' 
  AND token = '6k4KRscZKfKLKpEnOX81Ov/+JkPy4EqaCMlbCsd8lck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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