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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c9af38902c796ffabd2705ea1ff62992218aa6b72ff4c5d9a8dcc26ceec9b8' 
  AND token = 'FYOrOUkFWKhvHNn9oOSDn4tPHpgmPHecgW7wtOQ1AbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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