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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bfc5e344c35f9070df0d99c6465b5d4ccfa7d0420e37f40c74e58328aeaab1' 
  AND token = 'v40BHvfRviJ6VI4sojDQCNBptFPuDZknzGUjahBLEu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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