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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c8fb908f160a8a8bce8da9524ebcecce4768e8f592c1616adc7323f5d13103' 
  AND token = 'W5VvDVaQJI5XXfmI8PKyzf7dVU0Vvm0EbA4cV1d0nX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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