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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56dd8fe0e8b602df25a5b3d13290c9c2cc303a9a89200e1b6cf2a3685e4fc07' 
  AND token = 'P1W/ewd2YJ1NDN2StJtVR7HP0Rabe/FHNqIjM4nPP1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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