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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936564129898656984b33f54ac1256feb0a2a6cc5d26de7ceed302b00ca46b32' 
  AND token = 'dHsyu+5yEclw93Sn1MlIPmrhsy2MVKPDU83e1GZCuPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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