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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de29365358bd0f1dd2ca77fc0b240242990d2ab757e892b4dc6d0312519f98a' 
  AND token = 'tRNAlYIvoPEz7otVcGjgDEiITQ53xS6cVoLkEH2pa5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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