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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f6d644c92effa60edb37e7406edc7675755ed01a501e1461abf730bd954f8e' 
  AND token = 'z2WWNXymkll9Ni8523CTvSFu/6OGH2BmfmaWK2I7LLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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