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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a3a2637dd2cada11a8616ef29dd41618edda74770d1c9cf603bf32dde531e5' 
  AND token = 'IxJE7JCxIQ7ncBNY2J41Iyw3Putv/m5N3xuoizbeFrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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