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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda87809ba90c3e88fd0d896744f53f4607c28e6814616fa7fb4e017cc511ba7' 
  AND token = 'KEyKn1omU5BPyF5QkEtwE56Y3L57TR1+n7nJbxLdue8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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