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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3f4a7eba96e86eadaaedefbde96e2e490b88c19c0353dcd25f498bdd0a81f3' 
  AND token = 'VzxprBD2dZhemcaW0exNJA90z6x3HCNpy52s1mzM96U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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