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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313f2cfd295a713a1dfdb1e469bac3502b601339084be166ffa2e886ffaa1deb' 
  AND token = 'b8KN9naJJ6VB9YRN6g58pC13X8ANkrcqlxDQlZC5sNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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