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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb262557002da68e471c6071d86438074d8601ced431c30f2e5fc66a3371afa5' 
  AND token = 'tgiYEBe8lA9lLIVd3MJV/naw3G3B00uhK+vy1JaJnLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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