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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93900a665945f995d34f42a8100973aa11358f0013104c247843497f03367cfc' 
  AND token = 'zT7TgflU6XpPVHbesfGFceIHT87RDRDyGPP7QWpqyR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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