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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5b2d877c1126df3be3e3384610e0c567577ec1a4f76d49fd5ec6b0b182c3f9' 
  AND token = 'fJqpM4gYDdzWxvwUifANze08iOceKm+eiEVt1HDRv9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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