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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca1ecacd899602d2fc1e4bc9e3597f2efe8da42dddc65dfa43ccc308cafc09e' 
  AND token = 'ZRB+1RW3SU2DybWIS1vDeQW2v4/l2H+k3G+G+yLra/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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