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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b6362f0697a9fd9338ac382d9eb41d3b89f9783b77d061e251e2e52ebfc90e' 
  AND token = 'k6bM/0S31lAAHfR8eDP7W2nZdSH49xKnQsO4wwlrsl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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