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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76bd57c1cfacb0119626a76f340f2bcccf1d89edc4350d715ec8c44b6859b00' 
  AND token = '8jeqcBq/qQk4nfv5Fd3JhZYqMGp+odsC9qd6tXUAqo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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