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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be5c3e719c49a3e18606c7381f3cedea5ab679008a5ac68d190ac5c55c32587' 
  AND token = 'e0Ukpfzfw37l/99i13qXJZrx88Tryt8LMwF/3fxqGQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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