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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ef2bc37a96bccf605e87dc1528b90e74e88b50f61f780fbc6e78c66a93ba9e' 
  AND token = 'UDedBGIX66DUIEtqF2q4tZe3AMdlhTeo/z/OyiXT/p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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