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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98bd7ace7aea91e82798f54c87a07a74a2ba80d39b7432a8b63d66f1b2a88cc' 
  AND token = 'qZoQtxIN+J3NZ4nfOz/Ig0OIWc3DsuOYcdQskkZ744c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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