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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c295be189fdef7a45e13ff9dad61d8eaf7d6a94ac277c0335ffaeefbbbf6122b' 
  AND token = '46fduNXN9efhY6Yrs49gj5ae22F+mUZOXnEtGVMRapY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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