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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6befd4a8e21bf4131cb5b09272ca98d5346806d2989a8739b8d01e98fd2e56ff' 
  AND token = 'v7sgTjKR1nLxtp2Y8IKm+v+N7tFNXIJFe48mC5eTIuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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