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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcb069c7292ebd24307bc3be885ce5f9b87d836d1a41a61461782bd10015744' 
  AND token = 'pXGmWL86ttve23vqvLTd7MZP+L4bRqr5QHi533t60cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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