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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356bf80a990e44df52daa93d4c9d009d6c580d039d729a29f348e53fcb1f9cbe' 
  AND token = '0soqaMiXumMy9SylZfidF+R0K0spoFGg8+j/XKvni3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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