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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1bb6b6826d16d83e033a2205825b4acced7931412fd1d91c31c5be5ec972d0' 
  AND token = '5XqsZtuNNvGKH8RdBE6Y0Jvt4HxEMa/GebW4yVLOy90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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