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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa393197e03f70031078aea803949f3852c10fc733f8d9e13aaf0d5452e66d1' 
  AND token = '0PbUXiFHCyQXqgs9G2jZAznftGfYsUj5VxmUjoqiee0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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