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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8fef85602b00eb469dc3d1060fdb8caddef1505ae632085e941c88147fc6e5' 
  AND token = 'nPaJLOw3xphLXwxQqnBUXeRYmYV4TISM5Gx+aeEWo8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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