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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6fdaca85a3d5429ca899217d8033a695292ed54b81f3aa60437302c801b162' 
  AND token = 'z34TiUpEemhl75lIRXOdb5SmnZB+WHfMgURg51qNSPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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