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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f7c5d3c7ba1bc26115b1ef071a9397465099bba51aa69169b6c791c40d2aee' 
  AND token = '2P+wigJhPQ1dEBjtKjKY3Q94xc9adYV5MVb+Ot+d1AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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