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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f52761cab294492c1bf6662fd6e5a664efee10030f394d735a49b5bcc324453' 
  AND token = 'ZeWmlZDxJ0B9UnssqrrKr/ACi4Wz9AtdtUmuKYNcNG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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