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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da8bb359c28713e4209b3402ae5ae254138a7810f2c06db03e29750d0957c2c' 
  AND token = 'csJ8LNTJJxxHPvM8KRe0uXpyRberbT6gS3X7DERTtZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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