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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65644c98f5d8fa256463e4ea8a7fc8b7a2259366deeee90514f5146e548fdda' 
  AND token = 'C97AXp2suh1YRekOHNhKFYj9sfkJYpOM6yElrG5J23o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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