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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5d1f3f82382a135c77a210129f3c6761fe20d2dddacfc59cd7ca3b35de93c0' 
  AND token = 'Et4drw0b/Qs4zZGByL0tJNPYZK1CWY9TYiTKeBaAt9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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