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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11f98f0fb40f6313b71e896cda7a6d801260087d99a5008afc01bcb8af344b1' 
  AND token = 'N+HWT8fg5JNTn+H2gv5vHb3EYBpg05cIujRPHBFcDaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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