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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9689ed2da2c2ee928df6cd399f76d89cd4ae28af2ba11918303b613e497140a9' 
  AND token = 'FpBYwtg+5EngVw36mmtrRw2rFhY3y00zaouf/NLI9pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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