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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2670739ffb3d791f480f2a3d0bcb955919ad44e9e5a8ccb42cf1420079365aa7' 
  AND token = 'BsS95wPPHHFwuqwW4k2byQs1sHma49kxUkygk1Mk6hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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